Basic Electrical Wiring Picture

A wiring diagram is a simple visual representation of the physical connections and physical layout of an electrical system or circuit. It shows how the electrical wires are interconnected and can also show where fixtures and components may be connected to the system.

A wiring diagram is a type of schematic which uses abstract pictorial symbols to show all the interconnections of components in a system. Wiring diagrams are made up of two things: symbols that represent the components in the circuit, and lines that represent the connections between them. Therefore, from wiring diagrams, you know the relative location of the components and how they are connected.

How to Read Wiring Diagram?

Recognize Wiring Diagram Symbols

To read a wiring diagram, first you have to know what fundamental elements are included in a wiring diagram, and which pictorial symbols are used to represent them. The common elements in a wiring diagram are ground, power supply, wire and connection, output devices, switches, resistors, logic gate, lights, etc.

wiring diagram symbol

Line Junction

A line represents a wire. Wires are used to connect the components together. All points along the wire are identical and connected. Wires on some places need to cross each other, but that does not necessarily mean that they connect. A black dot is used to indicate the injunction of two lines. Main lines are represented by L1, L2, and so on. Usually different colors are used to distinguish the wires. There should be a legend on the wiring diagram to tell you what each color means.

contact no contact

Types of Connection

Usually circuits with more than two components have two basic types of connections: series and parallel. A series circuit is a circuit in which components are connected along a single path, so the current flows through one component to get to the next one. In a series circuit, voltages add up for all components connected in the circuit, and currents are the same through all components. In a parallel circuit, each device is directly connected to the power source, so each device receives the same voltage. The current in a parallel circuit flows along each parallel branch and re-combines when the branches meet again.

type of connection

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